create a generic midi mapping in the control editor window
press add in
select from deck common the “play/pause” option
press the learn button until it lights up yellow
press the button or key on your controller you want to map play to.
uncheck the learn button
change the thing that says hold to toggle.
you have just mapped a play button to your controller! with a little trial and error and experimenting with the options and some common sense you can use the link above to determine what youre trying to map and then map it.
please feel free to PM me if you want more help and id be glad to give whatever advice i can, mapping was very confusing to me at first and i remember wishing there was an easy way to learn it. in truth it is actually very easy once you get your head around it, albeit time consuming.